:root {
  --bg: #f3f6fb;
  --card: #ffffff;
  --text: #14213d;
  --muted: #5a6473;
  --brand: #0f6fff;
  --brand-deep: #0a4fb6;
  --line: #dde4ef;
  --ok: #0b7a4a;
  --warn: #a05a00;
  --shadow: 0 10px 30px rgba(12, 45, 99, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "IBM Plex Sans", "Avenir Next", "PingFang SC", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(1200px 500px at 15% -10%, #dbe9ff 0%, rgba(219, 233, 255, 0) 60%),
    radial-gradient(900px 460px at 100% -10%, #e4fff7 0%, rgba(228, 255, 247, 0) 55%),
    var(--bg);
  line-height: 1.6;
}

a {
  color: var(--brand-deep);
}

.site {
  max-width: 980px;
  margin: 0 auto;
  padding: 24px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}

.brand {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.2px;
  color: var(--text);
  text-decoration: none;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.nav a {
  text-decoration: none;
  color: var(--text);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.85);
  border-radius: 999px;
  padding: 7px 14px;
  font-size: 0.9rem;
}

.nav a:hover {
  border-color: var(--brand);
  color: var(--brand-deep);
}

.hero,
.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.hero {
  padding: 34px;
  margin-bottom: 18px;
}

.hero h1 {
  margin: 0 0 10px;
  font-size: 2rem;
  line-height: 1.2;
}

.hero p {
  margin: 0;
  color: var(--muted);
  max-width: 760px;
}

.cta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.btn {
  display: inline-block;
  text-decoration: none;
  padding: 10px 16px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
}

.btn.primary {
  color: #fff;
  background: linear-gradient(135deg, var(--brand), #00a0ff);
}

.btn.secondary {
  color: var(--brand-deep);
  background: #edf4ff;
  border-color: #cfe0ff;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 14px;
}

.panel {
  padding: 22px;
}

.panel h2,
.panel h3 {
  margin-top: 0;
}

ul {
  margin: 0;
  padding-left: 20px;
}

li + li {
  margin-top: 6px;
}

.note {
  margin-top: 16px;
  border-left: 4px solid var(--warn);
  background: #fff6e9;
  padding: 12px 14px;
  border-radius: 10px;
}

.ok {
  margin-top: 16px;
  border-left: 4px solid var(--ok);
  background: #ebf9f2;
  padding: 12px 14px;
  border-radius: 10px;
}

.footer {
  margin-top: 20px;
  padding: 16px;
  font-size: 0.9rem;
  color: var(--muted);
}

.kv {
  width: 100%;
  border-collapse: collapse;
  margin-top: 8px;
}

.kv th,
.kv td {
  border: 1px solid var(--line);
  padding: 10px;
  text-align: left;
  vertical-align: top;
}

.kv th {
  width: 36%;
  background: #f8fbff;
}

.small {
  font-size: 0.9rem;
  color: var(--muted);
}

@media (max-width: 640px) {
  .site {
    padding: 14px;
  }

  .hero {
    padding: 22px;
  }

  .hero h1 {
    font-size: 1.6rem;
  }
}